Mortising machine



1,690,697 C PALMUk MORTISING MACHINE Filed May l1, 3 Sheets-Sheet /z 212. .l'JLl-f.

. 3mm/dior 7a/ Faim@ Nov. 6, 1928.

Nov. 6, 1928. 1,690,697

C.PALMU MORTISING MACHINE Filed May ll, 1927 5 Sheets-Sheet 2 Q-ff Nov. 6, 1928.-

c. PALMU MORTISING MACHINE- Snoring 67aPa/mu Filed May l1, 192

Patented Nov. 6, 1928.

UNITED STATES CARL PALMU, OF DULUTH, MINNESOTA.

MORTISING MACHINE.

Application filed May 11, 1927,.l Serial No. 190,472.

This invention relates to new and useful improvements in the art of boring and drill- 'ing and more particularly to a boring or drilling attachment for drill presses or the like and the primary object of the invention is to'provide an attachment of this character which will in one operation bore square, oblong or irregularly shaped openings in wood or metal.

` A further object of the invention resides in providing an attachment including an endless carrier provided with blades adapted to engage the work in which the openings are to be bored, the links of the carrier being capable of removal individually and the carrier being capable of removal from the attachment at the will of the operator.

A still further object resides in providing various types of cutters which may be substituted as desired for the purpose of boring openings of a predetermined design.

Still another object resides in providing a device which is comparatively simple and durable in construction, inexpensive to manufacture and one which will be very eiicient and useful in operation.

With these and numerous other objects in view, mv invention consists in the novel features o construct-ion, combination and arrangement of parts as will be hereinafter rcferred to and more particularly pointed out in the specification and claim.

In the accompanying drawings forming a part of this application:

Figure 1 is a side elevation of my attachmentV applied to use, parts being shown in section and parts in fragment.

Figure 2 is a. horizontal section as seen on the line 2-2 of Figure 1.

Figure 3 is a similar view as seen on the f line 3 3 of Figure 1.

Figure 4 is a similar view as seen on the line 4-4 0f Figure 1.

Figure 5 is an enlarged fragmentary side elevation of the carrier, carrying the cutter elements, parts being shown in section.

Figure 6 is an enlarged fragmentary elevational view of a section of the carrier, sho-wing in detail the cutter element carried thereon.

Figure 7 is a vertical section as seen on line 7-7 of Figure 6.

Figures 8, 9 and 10 are fragmentary detail elevations, with parts in section, of modified forms of cutters which may be used with the device to provide various forms of openings in the work. and

Figures 11, 12, 13 and 111 are dia-grammatic views illustra-ting the various types of openings which may be formed with the varied forms of cutters illustrated.

Figure 15 is a. detail sectional view of a link and cutter blade particularly adapted for use in working on metal.

ln describing the invention, I shall refer to the drawings, in which similar reference characters designate corresponding parts throughout the several views and in which 1 designates the back or frame of a drill or similar machine or other support to which is adapted to be attached my improved boringattachment. Bolted, or otherwise removably secured to the portion 1 are the upper and lower supporting brackets 2 and 3. These brackets are each formed of two sections which are brought together in the form 0f a V and bolted together as shown at 4, the outer ends of the sections 0f the bracket being formed angularly to provide substantially a square guide opening as shown at 5.

Guided through the openings 5 of the braces or brackets 2 and 3 and adapted to move vertically therethrough is a bar 6, the lat-ter having at its lower end a lateral 'extension 7 and adjacent its upper portion a similar lateral extension 8. Formed on the end of the lateral extension 8 is one half of a bearing 9, the complementary portion thereof being bolted thereto as shown at 10. This bea-ring supports a` drive sha-ft 11 which receives its power from any desired source (not shown) and the lower end of said shaft just below the bearings 9 is secured to a bevel gear 12. This bevel gear 12 engages an additional bevel gear 13, the latter being carried on a. shaft 14. This shaft 14 is rotatably supported in a bushing 15 mounted in the bar 6, as clearly shown in Figures 1, and 3 of the drawings. A portion of this shaft 14 is square in cross section as shown at 16, said squared portion entering l a similarly shaped opening in the gear 13,

and said shaft 14 beyond the squared portion 16 is provided with a slightly enlarged frustoconical portion 17, which terminates finally in a reduced cylindrical ,portion 18.

shoulder 19 is provided between the portions 16 and 17 against which the gear 13 abuts and a shoulder 20 is provided between the portions 17 and 18 for a urpose to be hereinafter and more particular y -set forth. This shaft 14 is held in the bar 6 by means of a nut 21 engaging the threaded end 22, as shown in Figure 3 of the drawings. A boss 23 is formed on the bar 6 which also abuts the inner face of the gear 13 to prevent movement of the 'rotation therewith a sprocket 24 over which extends an endless chain 25. The end of the lateral portion 7 of the bar 6 is formed into a bearing to receive therethrough a stem 26, the lower end of which is formed with a fork 27 carrying an additional sprocket 28 over which said chain 25 is adapted to pass. The stem 26 is securely held in the bearing of the bar portion 7 by means of a set screw or the like 29. This chain 25 is adapted to carry the cutter blades through the medium of which the openings in the work may be formed.

The chain 25 is preferably formed with a plurality of links 30 which are recessed from the under face thereof as shown as 31 to receive the teeth of the sprocketstherein and said links are capable of interlocking engagement one with the other in a fashion as clearly shown in Figures 6 and 7 of the drawings. When the links are bent in a certain fashion with respect to one another the same may be disengaged by a lateral thrust.

IPredetermined links have formed integral with the outer faces thereof the cutter blades 32 which are slightly arcuate in cross section and fiare outwardly toward their outer cutting edges, the width of the cutting edge of each blade being greater than the width of the link, as clearly shown in Figures 1 and 6 of the drawings. As many links as desired may be provided with these cutter blades and it is apparent that as the blades are brought into engagement with the work, an opening will be formed therein, the arm 6 and the shaft 11 with all adjunctive parts being capable of vertical movement for obvious purposes. When a cutter blade such as designated by the numeral 32 is used, a square opening 33, such as shown in Figure 11, may be formed in the work. When it is desired to provide an oblong opening such as designated by the numeral 34 in Figure 12, it is only necessary to enlarge the sprockets 24 and 28` to compensate therefor.

When it is desired to provide an opening such as designated by the numeral 35 in Figure 13, links are provided in the chain having cutter blades 36 thereon, as shown in Figure 9. Thus a V-shaped end is provided in the opening. lVhen arced ends are provided in the opening, such as shown in the illustration designated by the numeral 37 in Figure 14, a cutter blade 38 is provided, such as shown 1n FigurelO. Of course, it is only necessary under such circumstances to replace the links carrying the cutter blades with links having the cutter blades of the desired shape to provide the desired opening.

The particular forms of cutters shown and described here above are especially adapted for wood boring. When the device is applied to use in connection with metal, it is desirable and essential that the cutters be of increased thickness, such as shown and designated by the numeral 39 in Figure 15 of the drawings.` I do not, however, desire to be limited to this particular construction as other forms and shapes may be provided for either wood or metal working.

It is apparent from this particular construction that the operator may readily replace parts which may become damaged and when it is desired to change the form of cutters, this may he readil accomplished by forming a slack in the c ain and removing certain links, or the entire chain removed and replaced by another when necessary.

To protect the operator against ini ury from iying material as the holes are formed in the work or from damage to any parts of the apparatus, I provide a shield 40 which is supported around the endless chain by means of an arm 41, the latter being bolted to the frame or back 1, as clearly shown in Figure 1 of the drawings.

From the foregoing description of the construction of my improved boring attachment, the operation thereof will be readily understood and it will be seen thatv I have provided a simple, inexpensive and eiiicient means for carrying out the objects of the invention. While I have particularly described the elements best adapted to perform the functions set forth, it is obvious that various changes in form, proportion and in the minor details of construction may be resorted to, within the scope ofthe appended claim, without departing from the spirit or sacrificing any of the principles of the invention.

Having thus described my invention, what I claim is:

In a mortising machine, a vertically movable bar, supporting means therefor, parallel spaced lateral extensions of said bar,rbear ings at the free ends of said extensions, said bearings being in a common plane, a driven shaft rotatably mounted on said arm and projecting laterally thereof between said lateral extensions and terminating in the common plane of the ends thereof, 'a sprocket carried at the outer end of said shaft to rotate therewith, a stem adjustable vertically within the s and parallel therewith, a second-sprocket ro- 'tatably supported at the end of said stem in' alignment with the lirst mentioned sprocket, an endless chain extending y over said sprockets', a drive shaft arranged in the bearing at one end of one of said extensions from the bar in the plane of said endless chain, and cutter blades carried by certain links of said chain, substantially as and for the purpose 10 set forth. n

`In testimony whereof I affix my signature.

' CARL PALMU. 

